The 22-year-old suspect behind the assassination of conservative activist Charlie Kirk is "not cooperating" with investigators, Utah Gov. Spencer Cox and two law enforcement sources said.

Cox stressed on several Sunday morning news shows that investigators are still trying to pin down a motive for the attack and said more information may come out once the suspect, Tyler Robinson, appears in court on Tuesday.

"There's so much more that we're learning, and so much more that we will learn," Cox said on CNN's "State of the Union." "There will be official charges filed on Tuesday, and there will be much more evidence and information available then. And again, we're interviewing all kinds of people, everyone that knows him, and trying to learn more about what that motive actually was."

See Full Page